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Posted to hdfs-issues@hadoop.apache.org by "Hrishikesh Gadre (JIRA)" <ji...@apache.org> on 2018/09/04 23:14:00 UTC
[jira] [Commented] (HDFS-13820) Disable CacheReplicationMonitor If
No Cached Paths Exist
[ https://issues.apache.org/jira/browse/HDFS-13820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603706#comment-16603706 ]
Hrishikesh Gadre commented on HDFS-13820:
-----------------------------------------
Note - I have reimplemented the functionality removed as part of HDFS-5651. It is not a clean revert of HDFS-5651, but only changes required to disable the centralized caching feature altogether. I am also working on HDFS-5376, which will implement incremental scanning of cache blocks and locations.
> Disable CacheReplicationMonitor If No Cached Paths Exist
> --------------------------------------------------------
>
> Key: HDFS-13820
> URL: https://issues.apache.org/jira/browse/HDFS-13820
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: caching
> Affects Versions: 2.10.0, 3.2.0
> Reporter: BELUGA BEHR
> Assignee: Hrishikesh Gadre
> Priority: Minor
> Attachments: HDFS-13820-001.patch
>
>
> Stating with [HDFS-6106] the loop for checking caching is set to be every 30 seconds.
> Please implement a way to disable the {{CacheReplicationMonitor}} class if there are no paths specified. Adding the first cached path to the NameNode should kick off the {{CacheReplicationMonitor}} and when the last one is deleted, the {{CacheReplicationMonitor}} should be disabled again.
> Alternatively, provide a configuration flag to turn this feature off altogether.
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